Other Income (Expense), Net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012	Jun. 30, 2011
Other income (expense)
Interest income	$ 0.1		$ 0.1		$ 0.2	$ 0.2
Unrealized gains (losses) on financial derivatives	0.7	[1]	(3.6)	[1]	1.2	(1.9)
All other, net	0.3		0.1		0.4	0
Other non-operating income (expense), net	$ 1.1		$ (3.4)		$ 1.8	$ (1.7)

[1] See “Derivative Financial Instruments” in Note 1 for a discussion of accounting policy for such instruments.